Nonpull plunger for bottle-making machines



May 22, 1928. 1,670,821

' H. -J. PAWLING ET A1.

NONPULL PLUNGER FOR BOTTLE MAKING MACHINES May. 22, 1928. 1,670,821

. l H. J. PAWLING ET AL NoNPULL PLUNGER FOR BOTTLE MAKING MACHINES Filed June' 19, A19,25 2 sheets-sneet 2 Patented May 22, 1928.

UNITED STATES PATENT OFFICE.

HENRY J., YAWLING `AND HARRY A. CBISPIN, 0F SALEN, NEW JERSEY, ASSIGNOBS T0 SALEM GLASS WORKS, OF SALEM, NEW JERSEY.

NONPULL PLUNGEB FCB BOTTLE-MAKING MACHINES.

Application med June 19, 1925. Serial No. 38,187.

The invention relates to glass bottle making, and has as its primary object to .rovide means for forming a seamless sea ing surface or mouth upon a glass bottle. A further object is to provide means whereby a uniform distance may be maintained in all bottles between the point where the bottle closure or cap grips the bottle and the' sealing surface of the bottle.

According to existing practice bottles made by machines frequently have irregular sealing surfaces, due to the adherence of the glass tg the plunger as it is withdrawn during the blank and neck forming operations. In such cases it is diiiicult to form `a tight seal or closure. The present invention eliminates this defect by providing a non-pull plunger whichvmay be readily applied to existing machines. With th'e improved plunger it is found that smoothness oi' the sealing surface is secured and a uniform distance between the closure gripping surface and the sealing surface is maintained.

The invention will be more readily understood by reference to the accompanying drawings in which the non-pull plunger is shown in its preferred embodiment.4

Fig. 1 is a View partly in section and partly in elevation, showing the improved plunger applied to a standard glass maklng machine, the neck forming operation being shown in the figure.

Fig. 1a is a fragmentary View, showing the plunger' tip withdrawn slightly from the position shown in Fig. 1.

Fig. 2 is a view similar to Fig. 1, but showing the bottle blank expanded. l

Fig. 3 is a 'detail view, showing the twopart neck ring.

Fig. 4 is a detail view on an enlarged scale, showing the non-pull plunger.

Fig. 5 is a view showing one of the bot-` tles produced by the use of the improved plunger.

For the purpose of illustration, the plunger is shown in Figs. 1 and 2 as applied to a glass blowing machine of standard construction. Such parts only of the machine as are necessary to anunderstanding of the present invention are shown in the drawings and a brief description of the operative features thereof will now be given.

Referring first to Fig. 1, the reference numeral 5 denotes a glass container or mold which has received lts charge of glass :30 from above in the usual manner. 'lhe mold 5 is held in a carrier 6 having au arm 5l. which is attached to a rotatable table (not shown). The mold 5 and the associated mechanism are moved from station to station by the carrier 6 in a well known manner, which it is unnecessary to ldescribe in detail, as this forms no part of the present invention.

When in the position shown in Fig. l, the

lglass container or press mold is directly beneath a blow head 4, shown in lowered position. The blow head is carried by the rod 3 oi piston 2, which works in a cylinder 1, whose position is fixed. Air from a suitable source of pressure 'A is admitted through passage B above the piston 2, and a flexible brauch pipe C leads to the blow head 4. Another pipe D communicates with the lower face o piston 2.

When the blow head 4 is in contact with the press mold 5, as shown, compressed air from the pipe C is admitted to the molten glass 50, compressing it so as to fit tightly within the mold.

Below the press mold 5 is a two-part neck or finishing ring 8, the parts of which are secured toa member 11, which in turn is secured to a carrier 13 having a rotatable arm 52. The carrier 18 likewise assists in supporting a cylinder 15 mounted in a carrier 17 having a'rotatable arm 53.` Within the cylinder 15 is mounted a plunger 18 having a central air passage 54.

The, plunger 18 is provided with a spring 16, one end of which engages a ange 54 located within the cylinder 17. The lower end of the plunger 18 is enlarged as at 55 and is adapted to be engaged by means of a drawbar 19 carried upon the upper end of a piston rod 20, the head 22 of which works in a suitable air cylinder 21 and is operated by compressed airA admitted at E and F 1ocated respectively above and below the piston head.

It will be noted that all the parts referred.

to in the above description located between the blow head 4 and the drawbar 19 are and22 are reciprocated vertically therein,

slime "glass isibroken, and when being brought into engagement with the parts carried by the rotating table at the proper instant to perform their respective functions.

The arts above described are or may be oi stan ard construction and form part of a glass bottle making machine of standard type.

n addition to these elements, there is frequently provided a removable plunger head, which cooperates with the glass container 5 and neck mold 8 to form tbe complete neck mold, the molten glass being compressed tightly about the neck ring and plunger bead. This plunger head, according to existing practice, is of one-piece construction, and when withdrawn tbe glass adheres to tbe plunger head, thus producing, an uneven sealing surface upon tbe neck ci the nisbed bottle.

The present invention overcomes this dei-ect by providing a plunger bead oi special construction, as shown in big. li. 'lfbc `Longer bead consists oie. body member 56 bai-ing a ltiireadcd stem 5? adapted to bev screwed into the top ci plunger 18 and baving a plunger tip 7, about wbicb, as shown Fig, l, tbe molten glass is pressed urng tbe neck-forming operation. The plus ler up 'i' is slotted, es at 58, and tbrougli ibis slot .a pin 59 is passed by means of wbicb a. ring or sleeve 9 is attached to tbe plunger. is shown, tbe plunger bodyA 5b is boilowed centrally, as at 6G, and a strong compression spring i2 is mounted in tbe bollowed-out portion. @ne end ci tbe spring l2 engsges tbe pin 59, thereby tending to bold tbe sleeve et its uppermost position. 'llie lower end oi tbe spring engages a centrally apertured plug l within tbe plungerbody. The er.- largcd portion' 61 ci the plunger body 5o is rovided with passages 62 communicating witb. the central passage o@ to: a purpose to be described bereinaiter.

The operation of the device "will be evideut from tbe orc'going description. After tbe glass lies been poured into the mold and pressed rmly about tbe neck ring 8, tbe ertip 'Z' and sleeve 9, air pressure from beneatli piston 22 is out od an air admitted hom above at E, thus withdrawing the piston. Due to the action oi tbe spring 12, tbe sleeve 9 is held in contact with the glass at the sealing surface for an instant after tbe plunger tip 7 begins to withdraw. See Fig la. lo. this manner tbe adhesion of tbe tbe sleeve 9 is completion of the operation just into contact with the top of the mold 5 by f i means of a piston 24 secured to said plate by a rod 25, and operatinv in a stationary cylinder 23. Compressed5 air for operating said piston may be admitted at G and H located respectively above and below the piston bead.

Below tbe rotating parts is, located another cylinder 219, within which is a piston 3b which is connected to a blow head 27 by means of a piston rod 28. Gompressed air for operating tbc piston may be admitted at L and bi above and below the piston head. Compressed air irom any suitable source of supply is admitted to tbe blow head through s. desible pipe d. The plunger 18 is held rmly in contact with tbe blow head by means oi tbe coil spring l5. Y

ompressed air irom tbe blow head now passes through tbe central opening 54 in .plunger i8 and through passages 60 and 62 in tbs plunger plunger bead and into tbe bottle blank 50, which is tlius expanded to the form shown in liig. 2a

ibis operation having been completed the bead 56, thence around the Elli lull

blank is subjected to tbe other well known operations until tbe tained. p

The bottle, es snows in lig, 5, is .provided with a tbreaded neck, due to theiprle'scnce ci corresponding threads in the neck mold. Elie sealing suriece G of tbe bottle is per iectly smootb, dus to the operation of tbc non-pull plunger, and the threads N or closure-gripping sri'iace are at a predetermined distance from tbe sealing surface. ln manner an air-tight lit is assured when the cap or closure is applied to the bottle.

i. For use in glass bottle-making meliuisbed bottle is obiis y cbiues, a. removable plunger bead, compris- 'ing a centrally apertured plunger body having a threaded stem adapted to be secured in a standard plunger; a slotted plunger tip integral tberewitb, a sleeve surrounding said tip and secured thereto by a pin and slet connection, and a compression spring mounted in tbe central aperture ci said plunger body and reacting between said plunger bode@J and said sleeve 2. non-pull plunger for glass bottle making, comprising combination a plunger body having a plunger tip integral therewith, a central passage through said plunger body, a sleeve surrounding said tip and having a pin and slot connection therewith, a compression springv mounted in the central passage of said p unger body and bearing at one end against said pin, and at the othercnd against a projection in `said central passage.

v3. In a bottle-making machine, in combination with a mold adapted to receive a charge of glass for forming a bottle blank, a neck ring located adjacent said mold, a plunger head adapted to coope 'ate with said mold and neck ringfor forming the bottle finish, and apertured to permit passage of air, said plunger head having a plunger tip integral therewith aboutwhich molten glass is adapted to be compressed, a sleeve surrounding said tip and having a. pin and slot connection therewith and adapted to engage the sealing surface of the bottle blank, and a spring interposed between said tip and sleeve adapted to press said sleeve in contact with the said sealing surface momentarily after said plunger tip has been witlnlrawn.

4. In a bottle-making machine, in combination, a neck ring, a plunger cooperating with said neck ring to form a bottle finish, and means for forcing molten glass downwardly about said neck ring and plunger, said plunger comprising a plunger body, a plunger tip and a sleeve surrounding said tip, said sleeve and tip being adapted to engage said molten glass, a pin and slot connection between plunger tip and said sleeve,

and a compression spring engaging said pin.

at one end and said plunger at the other. whereby. when said tip is withdrawn the sleeve remains momentarily in contact with the molten glass.

5. In a glass bottle-making machine, in combination, a. mold adapted to receive a charger of molten glass, a blow head about said mold, a neck ring and plunger adjacent said mold and cooperating to form a bottle finish when the charge is forced downwardly by said blow head, said plunger comprising plunger tip and sleeve having a pin and slot connection, means for holding said plunger tightly against the mold, resilient means interposed between said plunger tip and sleeve tending to force said sleeve upwardly against the molten charge, whereby when said holding means is released the sleeve is maintained momentarily in contact with the charge after the plunger tip has been withdrawn.

6. In combination with a glass bottle-making machine having a mold adapted to receive a charge of molten glass for forming a bottle blank, a neck ring located adjacent said mold, a reciprocable plunger having a removable plunger head therein adapted to cooperate with said neck ring to form the bottle finish, said plunger head being aper- :turcd to permit the passage of air therethrough, said plunger head comprising an venlarged body member having a reduced plunger tip integral therewith, adapted to extend into the glass in said lnold, a sleeve of substantially the same diameter as said body member surrounding said tip and .adapted to engage the sealing surface of said vbottle blank, and a. compression spring 1nterposcd between said sleeve and said plunger tip whereby said sleeve is momentarily maintained in contact with said sealing surface after-the plunger tip is withdrawn.

7. In a glass bottle making machine, a removable plunger head comprising a threaded plunger body adapted to be secured in a standard plunger, said plunger and plunger body being centrally apertured to permit through passages of air, a plunger tip of reduced diameter integral with saidv lunger head, and av sleeve of substantially t 1e same diameter as said body member encircling said plunger tip and resilient means urging said sleeve toward the free end of the tip.

8. In a bottle making machine, in combination, a neck ring, a plunger cooperating with said neck ring to and means for forcing molten glass downwardly about said neck ring and plunger, said plunger being centrally apertured t0 permit passage of air, said plunger having a removable plunger head comprising an enlarged plunger body apertured to permit passage of air, a plunger tip integral with said plunger body of reduced diameter, a. sleeve of substantially the same diameter as said plunger tip encircling said tip and axially movable relative thereto, and resilient means urging said sleeve toward the free end of the tip.

9. For use in glass bottle-making machines, a non-pull plunger comprising an enlarged plunger body, a reduced plunger ytip integral with the plunger body, a sleeve encircling said tip of substantially the same diameter as said plunger body, and means 'for urging said sleeve toward the free end of the tip.

10. For use in glass bottle-making maform a bottle finish, l

chines, a removable plunger head, comprisy ing an enlarged' plunger body having a threaded nipple, a reduced plunger tip integral with the. plunger body, a sleeve encircling said-tip, ot' substantially the same diameter as said plunger body, and means urging said sleeve toward the free end of said ti p11. For use in glass bottle-making machines, a plunger head having a slotted plunger tip integral therewith, a sleeve surrounding said tip and secured thereto by a pin and slot connection, and resilient means urging said sleeve toward the free end of said up.

4 a mman:

12. A non-.pull plunger for vglass bottlesaid plungerbody, encircling said tip, and

making comprising in combination, an enresilient means urging said sleeve toward the l0 Y larged plunger body having a, reduced free end of the tip.

plunger tip integral therewith a central-air In testimony whereof,we aix our signa,- 5 passage through said lunger liodyandl lattures.

eral openings throng said plunger body communicating with said central opening, a HENRY J. PAWLING.

sleeve of substantially the same diameter as HARRY A. CRISPIN. 

